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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f603fbf8de09de668c05a23e557e62e8418dc7ebab057f43468e16a50021134e' 
  AND token = 'q2xZprrf6fY4Gi3EJ1xvZgor3zJCEBcnmuuxOQ9Nj4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}